Advantages of fluidized bed dryer, dryer fluidized bed cooling method

The advantages of fluidized bed dryer mainly include:

High efficiency: The fluidized bed dryer adopts fluidized drying technology, which makes the material in a moving state through high-speed vibration and air flow, so as to make the contact between the material and the drying medium more sufficient, and improve the drying efficiency.

Wide applicability: The fluidized bed dryer can be applied to various types of materials, including granular, powdery, flaked, etc., and is suitable for materials with different properties, such as fragile materials, viscous materials, etc.

Environmental protection: The fluidized bed dryer adopts a fully enclosed structure, which effectively prevents the cross-infection of materials and outside air, and the working environment is clean. At the same time, the hot air used in the drying process can be recycled, reducing energy waste and exhaust emissions.

Adjustability: The operating parameters of the fluidized bed dryer can be adjusted in a wide range, such as material thickness, moving speed, amplitude, etc., which can be adjusted steplessly, and can be adjusted according to different materials and drying requirements.

Reliability: The fluidized bed dryer has simple structure, balanced operation, easy maintenance, long service life, and can realize continuous automatic production.

Economy: The drying speed of the fluidized bed dryer is very fast, the time is easy to select, and the dry material with very low moisture content can be obtained, and at the same time the energy consumption and exhaust gas emission are reduced, and it has good economy.

In a word, fluidized bed dryers have the advantages of high efficiency, wide application, environmental protection, adjustability, reliability and economy, and have been widely used in many fields.

1. The vibrating fluidized bed dryer is driven by vibrating motor, which has stable operation, low noise, long life and convenient maintenance.

2. The vibration of the vibrating fluidized bed dryer makes the material easy to reach the fluidized state, which increases the effective heat transfer coefficient, so the thermal efficiency is high. The temperature of the bed is evenly distributed, and there is no local overheating. Uniform fluidization, no dead angle and blow-through phenomenon.

Vibration plays a conveying role and is also conducive to energy saving. It can save 30-60% energy compared with general drying equipment. Fluidized bed dryer.

3. The thickness of the material layer, the moving speed and the amplitude in the machine can be adjusted steplessly, with good adjustability and wide speed.

4. The surface damage of the material is small, which can be used for the drying of fragile materials, and can also be used when the material particles are irregular, without affecting the effect.

5. The vibrating fluidized bed dryer adopts a fully enclosed structure, which effectively prevents the cross-contamination of materials and the outside world, cleans the environment and improves the working conditions.

6. Vibration promotes fluidization, which reduces the air demand and the particle entrainment rate.

The drying speed of the fluidized bed dryer is very fast, the temperature in the fluidized bed is uniform and easy to control and adjust, and the time is easy to select, so the dry material with very low moisture content can be obtained.

There are several methods for cooling the fluidized bed of the dryer:

1.Water cooling: A water bureau cooling device is set at the outlet of the dryer to reduce the temperature of the dryer outlet by spraying water mist or water curtain.

2.Gas circulation: By circulating a part of the cooling gas at the outlet of the dryer, it is introduced into the dryer again to achieve the purpose of cooling. Tonghu.

3.Increase air volume: By increasing the air inlet or outlet volume of the dryer, the air flow in the dryer is more rapid, so as to achieve the effect of cooling.

4.Increase humidity: spray a certain amount of water vapor at the outlet of the dryer to increase the humidity inside the dryer, so as to achieve the effect of cooling.

5.Reduce the amount of feeding: By reducing the amount of material incoming in the dryer, the temperature inside the dryer is reduced, so as to achieve the effect of cooling.

There are many ways to use the dryer fluidized bed to cool down, and the following methods can be used according to the actual situation: 1Cooled heat exchanger; 2.

Increase the humidity of the air; 3.increase the flow rate of the fluidized bed; 4.increase the temperature of the cooling water; 5.

increase the temperature of the fluidized bed, etc.

1 is a commonly used cooling method.

2. The principle of this cooling method is to send high-temperature materials into the fluidized bed, and inject low-temperature air flow into the bed to cool or delay, so that the temperature of the material drops.

3 has a wide range of applications, which can be used to cool down various forms of materials, including granules, powders, granules, and other states of matter.

At the same time, this method also has the advantages of high cooling efficiency and easy operation, so it is widely used in production practice.

The fluidized bed drying method uses heated air to evaporate water through particles or pellets to achieve the purpose of drying.

The fluidized bed dryer is to put the liquid materials such as powder granules, fertile (and even suspension and solution) on the air flow distribution plate such as perforated plates, and feed the drying medium with a considerable speed from the lower part of it. When the flow rate of the medium is low, the gas flows between the particles of the material, and the whole material layer does not move; As the airflow velocity gradually increases, the material layer begins to expand and the gap between particles increases. Then increase the air velocity, a considerable part of the material is suspended, forming a gas-solid mixed bed, that is, the fluidized bed, because the suspended material in the fluidized bed is very similar to a boiling liquid, so it is also called the boiling bed, and it presents the properties of a fluid in many aspects, for example, there is an obvious upper interface, and remains level; If the air flow rate is increased, almost all the particles are carried away by the air flow, and it becomes gas transportation. Therefore, the airflow velocity is the most fundamental control factor of the fluidized bed dryer, and the appropriate airflow velocity should be between the beginning of fluidization of the material layer and the removal of the material.

Heat transfer in a fluidized bed can be done through an outer jacket or an in-bed heat exchanger. When using the in-bed heat exchanger, in addition to the requirements of the general heat exchanger, it must also take into account its influence on the flow of materials in the bed, that is, the form and installation of the heat exchanger should be as conducive to the normal flow of fluid as possible. It has been proved in practice that when the tube heat exchanger is adopted, it is difficult to disperse and fluidize the muddy paste material with high water content 2 5 from the center of the equipment from the center of the equipment.

Put some inert carriers (such as quartz sand, alumina, oxidized balls, granular salts, etc.) at the bottom of the dryer, and when they flow under the action of a certain flow rate, the wet material will adhere to its surface, and then make it a dry shell. Due to the collision and friction of the inert carriers, the dry shell will fall off and be carried away by the medium flow; The carrier itself comes into contact with the new wet material and forms a dry shell. In this way, the fine wet sticky material can also be fully dried in the fluidized bed dryer.

Zhongtong vibrating fluidized bed dryer is a kind of reinforced special purpose drying device, which is usually used for the final drying of materials. Because the mechanical vibration helps the material to fluidize during the drying process, it is not only conducive to the turbulence of the boundary layer and strengthens the heat and mass transfer, but also ensures that the drying equipment works under relatively stable flow mechanical conditions. In addition to having a good drying function, this kind of equipment can also be accompanied by material granulation, cooling, screening and conveying processes according to process needs.

At present, it has been widely used in sugar, medicine, fertilizer, chemical, plastic, dairy, salt, mining and metallurgy and other industrial sectors. This technology is basically mature and has been serialized.

At present, the most widely used horizontal vibrating fluidized bed dryer is very similar in shape and basic structure to ordinary horizontal fluidized bed dryer. The difference is that the whole body of the vibrating fluidized bed is supported on the base by a spring, the perforated plate is slightly inclined to the discharge end, and one or both sides of the body are equipped with vibrating motors. The material is fluidized by mechanical vibration and perforated air flow, and moves forward under the action of vibration.

The machine is thrown by the vibrating motor to generate excitation force, the material jumps forward under the action of the excitation force in a given direction, and the hot air input under the bed makes the material in a fluidized state, and the material particles are in full contact with the hot air, so as to achieve the ideal effect. The material enters the machine from the feed port, and under the action of vibration force, the material is thrown forward in the horizontal direction and moves continuously. The hot air passes upwards through the fluidized bed and the wet material for heat exchange, the moist air is discharged from the exhaust outlet after dust removal by the cyclone separator, and the dry material is discharged from the discharge port.

It has very outstanding advantages:

1) Uniform fluidization can be obtained at very low gas velocity, which greatly reduces energy consumption, wear between particles and dust entrainment;

2) The material residence time is evenly distributed, which can almost be regarded as "piston flow", and the residence time is easy to adjust and control, so a very ideal product moisture content can be obtained.

Chemical industry: all kinds of tablet granules, boric acid, borax, hydroquinone, malic acid, maleic acid, etc.

Food and building materials: wine trough, monosodium glutamate, sugar, salt, slag, watercress, seeds, etc.

It can also be used for cooling, humidification, etc.

Features: The material is heated evenly, the heat exchange is sufficient, the drying strength is high, and it is about 30 times more energy-saving than the ordinary dryer.

The vibration source is driven by a vibrating motor, which has stable operation, convenient maintenance, low noise and long life.

The fluidization is stable, and there is no dead angle and blow-through. ZLG series vibrating fluidized bed dryer.

The adjustability is good, and the width of the adaptation surface, the thickness of the material layer and the speed of movement in the machine can be adjusted steplessly with amplitude changes.

It has little damage to the surface of the material, and can be used for the drying of fragile materials, and it does not affect the working effect when the particles are irregular.

The fully enclosed structure effectively prevents cross-contamination between materials and air, and the working environment is clean.